| Reith Hall Productions Limited | Information & communication | 2023 |
| Rejuvenate Carpet Cleansing Limited | Households | 2016 |
| Rejuvenate Clinics Wakefield Ltd | Health & social care | 2017 |
| Rejuvenate Landscaping and Groundworks Limited | Administrative & support | 2018 |
| Rejuvenation Rooms Medical Aesthetics Ltd | Health & social care | 2024 |
| Rekha Technical Solutions Ltd | Administrative & support | 2026 |
| Rekindle Services Group Ltd | Administrative & support | 2016 |
| Rekordeo Ltd | Wholesale & retail | 2022 |
| Relative Limited | Information & communication | 2018 |
| Relax Care Cymru Limited | Health & social care | 2025 |
| Relaxa Brand Ltd | Arts & recreation | 2025 |
| Relaxgen Ltd | Information & communication | 2021 |
| Relentless Property Management Ltd | Real estate | 2024 |
| Reliable Care Services Ltd | Health & social care | 2025 |
| Reliable EUR App Logic Ltd | Information & communication | 2025 |
| Reliable Management Ltd | Households | 2019 |
| Reliable Routes Psychological Services Ltd | Education | 2025 |
| Reliable Support Ltd | Health & social care | 2021 |
| Reliaflow Limited | Water & waste | 2020 |
| Reliance Industry Co., Limited | Professional & scientific | 2008 |
| Reliance Medics Limited | Professional & scientific | 2019 |
| Reliance Security & FM Ltd | Information & communication | 2020 |
| Reliance Training Ltd | Education | 2025 |
| Reliancegifts Limited | Wholesale & retail | 2015 |
| Reliant Risk Management Ltd | Professional & scientific | 2025 |
| Reliant Risk Solutions Ltd | Financial services | 2023 |
| Reliatec Limited | Manufacturing | 1989 |
| Relicorv | Professional & scientific | 2025 |
| Relief Wear LAB Ltd | Wholesale & retail | 2025 |
| Reliq Philosophy Ltd | Wholesale & retail | 2025 |
| Relish Design Limited | Professional & scientific | 2003 |
| Relle London Ltd | Wholesale & retail | 2021 |
| Reload Digital Marketing Ltd | Professional & scientific | 2021 |
| Rels Brand Ltd | Manufacturing | 2019 |
| Reltra Limited | Wholesale & retail | 2025 |
| Remarkable Creative and Excellent Limited | Wholesale & retail | 2021 |
| Remarkable Sparkle Ltd | Administrative & support | 2023 |
| Remaxhost Limited | Wholesale & retail | 2021 |
| Remborn IT Corp Ltd | Information & communication | 2025 |
| Remedy Coffee Club Ltd | Hospitality | 2026 |
| Remedy Recovery and Wellness Club Ltd | Health & social care | 2025 |
| Remgen Limited | Water & waste | 2015 |
| Remi Builders & Maintenance Ltd. | Construction | 2011 |
| Remi Holdings Limited | Financial services | 2020 |
| Remitly U.K., Ltd | Financial services | 2015 |
| Remnant Christian Network Wales Ltd | Other services | 2023 |
| Remoda Ltd | Real estate | 2023 |
| Remote Accounting Academy Ltd | Education | 2025 |
| Remove Spray Ltd | Construction | 2024 |
| Removestar Ltd | Transport & logistics | 2024 |
| Rempods Limited | Health & social care | 2013 |
| Remr Maintenance Ltd | Wholesale & retail | 2025 |
| Remson IT Ltd | Information & communication | 2020 |
| Remus Dreadnought Limited | Administrative & support | 2022 |
| REN Veterinary Services Limited | Professional & scientific | 2023 |
| Renaissanceit Limited | Information & communication | 2019 |
| Renal UK Ltd | Professional & scientific | 2019 |
| Rencontre Zen&Tea Ltd | Wholesale & retail | 2024 |
| Rendal Clothing Limited | Wholesale & retail | 2020 |
| Rendercube Design Solutions Ltd | Arts & recreation | 2013 |
| Renderra Ltd | Information & communication | 2026 |
| Renderthermal Limited | Construction | 2018 |
| Rene Guido DE LA Porte | Administrative & support | 2024 |
| Rene Residential Ltd | Real estate | 2017 |
| Renegade Homes Limited | Professional & scientific | 2006 |
| Renegade Investments Limited | | 2007 |
| Renegade Motorcycles Limited | Wholesale & retail | 2025 |
| Renew Construction Services Limited | Construction | 2022 |
| Renew Kitchen Doors UK Limited | Wholesale & retail | 2006 |
| Renew Recruitment Limited | Administrative & support | 2024 |
| Renewable Electrics Ltd | Construction | 2024 |
| Renewable Energy Commercial Consultancy Limited | Energy | 2021 |
| Renewable Energy Services Africa Ltd | Construction | 2019 |
| Renewable Green Homes Ltd | Construction | 2019 |
| Renewables Consultants Limited | Professional & scientific | 2019 |
| Renewco Energy Ltd | Professional & scientific | 2020 |
| Renforcement Construct Pro Ltd | Construction | 2025 |
| Rennils Plumbing Ltd | Construction | 2018 |
| Reno-Spray UK Ltd | Construction | 2018 |
| Renovare Skin Limited | Wholesale & retail | 2021 |
| Renovation Solution Cardiff Ltd | Water & waste | 2025 |
| Renovations (NW) Ltd | Construction | 2019 |
| Renovo Properties Group Ltd | Real estate | 2026 |
| Renroc Asset Management Limited | Real estate | 2019 |
| Renroc Limited | Other services | 2018 |
| Rensa Solutions Limited | Wholesale & retail | 2020 |
| Rensburg Ltd | Financial services | 2021 |
| Rent a Taxi Ltd | Administrative & support | 2022 |
| Rent a Venter UK Ltd | Extraterritorial | 2015 |
| Rent Guarantee Scheme Limited | Real estate | 2013 |
| Rent TEC Ltd | Administrative & support | 2024 |
| Rent Yours Ltd | Real estate | 2019 |
| RENT2BUYTV Ltd | Administrative & support | 2011 |
| Rental Heroes Ltd | Real estate | 2023 |
| RENTAL9 PVT Ltd | Transport & logistics | 2019 |
| Rentalot Limited | Administrative & support | 2025 |
| Rentals Made Simple Ltd | Real estate | 2020 |
| Rentalspec Products Ltd | Manufacturing | 2009 |
| Rentid Limited | Information & communication | 2018 |
| Rentlite Ltd | Real estate | 2020 |